NOAA S-57 chart cell
Gulf Intracoastal Waterway - Grand Lake and Mermentau River
US4LA1GD
- Usage band
- Approach · code 4
- Current edition
- 1.2
- Features
- 786
- S-57 layers
- 40
- Published
- Sep 29, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.00000° N
- South
- 29.70000° N
- West
- 93.00000° W
- East
- 92.70000° W
- Center
- 29.85000° N, 92.85000° W
- Bounds area
- 281 sq nm
- Feature density
- 2.7932 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 19.7
- Smallest layer
- 1
- Largest layer
- 141
- Area sq km
- 965
- Features per sq km
- 0.81437
- COALNE Coastline 141
- BUISGL 87
- LNDRGN Land region 77
- RIVERS River 65
- LNDARE Land area 55
- DEPARE Depth area 43
- SLCONS Shoreline construction 29
- LAKARE 28
- SEAARE Sea area 28
- OBSTRN Obstruction 25
- DEPCNT Depth contour 23
- DAYMAR 18
- CANALS 17
- BCNLAT Lateral beacon 16
- VEGATN 14
- PILPNT 13
- CTNARE Caution area 10
- LIGHTS Light 10
- M_QUAL Data quality 10
- PIPARE 10
Nearby Chart Cells
Approach usage band
Current Edition Files
The NOAA ZIP archive is the upstream source for this chart cell; the other files are Open Ships generated derivatives for web and GIS use.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4LA1GD.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1GD/1.2/US4LA1GD.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1GD/1.2/US4LA1GD.001
- S-57 update 002 https://charts.openships.ai/noaa/s57/approach/US4LA1GD/1.2/US4LA1GD.002
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1GD/1.2/US4LA1GD.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1GD/1.2/US4LA1GD.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1GD/1.2/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.2 | Sep 29, 2025 | metadata.json |